Improvement in cut-off valves



T. WHITTAKER.

Gut-Off Valve.

No. -I96,847. Patented Nov.. 6, 1877 all-w;

? fmvnmom ATTORNEYS.

r WITNESSES:

MPEIERS; PHDTO-QTHOGRAFHER WASHINBYON. D C.

IT DS ATES were Trrornls WHITTAKER, or mssllic, NEW ERSEY;

IMPROIVEIIVIENT lN'CUT-OFF VALVES.

' Specification forming part of Letters Patent No. 196,847, dated November 6, 1877 application filed October 10, 187 7.

, To all whom it may concern:

Be it known that I, THOMAS WHITTAKER, of Passaic, in the county of Passaic and State of New J ersey, have invented a new andlmproved Gut-off Slide-Valve, ofwhich the following is a specification:

In the accompanying drawing, Figures 1 and 2 represent vertical longitudinal and transverse sections of my improved cut-ofl' slide-valve, respectively, on lines :0 m, Fig. 2,

and y y, Fig. 1. Fig. 3 is a top view of the and diminished as the speed accelerates, and

increased as the speed decreases, so asto secure uniformity of speed; and the invention consists of a balanced slide-valve that is guided in a transversely-sliding plateor frame connected to the governor of the engine.

The steam-ports of the cylinder, as well 'as the arched cavities of the slide-valve, are made tapering, to cut off the steam by the lateral throw of the valve-frame by the governor.

In the drawings, Arepresents the top plate of the steam-cylinder, which is provided with tapering steam-ports a, that connect with the customary steam-ducts to convey the steam to either side of the piston.

The top plate Ais further provided with steam-induction channels b at both sides of the parts a, and with an eduction-channel, d, between the ports, of oblong shape.

The slide-valve B is arranged with three arched cavities, e, at the under side, of which the outer are tapering at the sides, corresponding with the tapering sides of the steamports, to establish the connection of the steam induction and eduction channels with the steam-ports, and secure the admission and exhaust of the steam to the cylinder through the ports a.

The slide-valve B is made wider than the steamports, and reciprocated in the usual manner from the eccentric, and balanced by spring-pressure acting on the top of the valve,

or by other means, so that by this construcv tion a steam-chest is dispensed with, and an easily-working slide-valve of simple construction obtainec The slide-valve B is guided in a longitudi nal recess of a slide plate or frame, 0, that .is connected in suitable manner with the governor of the engine. j

- The slide frame or plate 0 is moved by the governor, in dovetail guides of the top plate A, transversely to the throw of the slidevalve, and gives the slide-valve, by the, ta-

pering or angular ports and cavities, the action of a cut-0E, by enlarging or diminishing the size of the steam-ports, so as to increase or diminish the quantity of steam admitted to the engine, according to thespeed of the same.

If the speed of the engine is. accelerated, the, slide frame and valve will be moved by thegovernor so as to produce a diminution of the steam inducted, and, conversely, when the 1. As an improvement in slide-va1ves,the

combination, with the top plate of the cylinder, having tapering steam-ports and induction and eduction channels, of a balanced slide-valve with correspondin gly-taperin g cavities, to which longitudinal and transverse motion is imparted for regulating the speed of engine substantially as andkfor the purpose a transverselyreciprocating slidafiame or set forth. I p plateconnected to govemoxg snbstantiallyas 2. The combination of the top plate of a and for the purpose specified. steam-oylinderfhaving tapei'ing steam-ports THOMAS WHITTAKEB. I

and induction and. eduotion channels, wlth a Witnesses: 3

balanced slide valve having correspondingly PAUL GOEPEL, tapering cavities, the valve being uided by G. SEDG'WIOK. 

